usr.sbin/autofs/log.c

   1 /*-
   2  * Copyright (c) 2016 The DragonFly Project
   3  * Copyright (c) 2012 The FreeBSD Foundation
   4  * All rights reserved.
   5  *
   6  * This software was developed by Edward Tomasz Napierala under sponsorship
   7  * from the FreeBSD Foundation.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  */
  31
  32 #include <errno.h>
  33 #include <stdarg.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <syslog.h>
  38 #include <vis.h>
  39
  40 #include "common.h"
  41
  42 static int log_level = 0;
  43 static char *peer_name = NULL;
  44 static char *peer_addr = NULL;
  45
  46 #define MSGBUF_LEN      1024
  47
  48 void
  49 log_init(int level)
  50 {
  51
  52         log_level = level;
  53         openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON);
  54 }
  55
  56 void
  57 log_set_peer_name(const char *name)
  58 {
  59
  60         /*
  61          * XXX: Turn it into assertion?
  62          */
  63         if (peer_name != NULL)
  64                 log_errx(1, "%s called twice", __func__);
  65         if (peer_addr == NULL)
  66                 log_errx(1, "%s called before log_set_peer_addr", __func__);
  67
  68         peer_name = checked_strdup(name);
  69 }
  70
  71 void
  72 log_set_peer_addr(const char *addr)
  73 {
  74
  75         /*
  76          * XXX: Turn it into assertion?
  77          */
  78         if (peer_addr != NULL)
  79                 log_errx(1, "%s called twice", __func__);
  80
  81         peer_addr = checked_strdup(addr);
  82 }
  83
  84 static void
  85 log_common(int priority, int log_errno, const char *fmt, va_list ap)
  86 {
  87         static char msgbuf[MSGBUF_LEN];
  88         static char msgbuf_strvised[MSGBUF_LEN * 4 + 1];
  89         char *errstr;
  90         int ret;
  91
  92         ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
  93         if (ret < 0) {
  94                 fprintf(stderr, "%s: snprintf failed", getprogname());
  95                 syslog(LOG_CRIT, "snprintf failed");
  96                 exit(1);
  97         }
  98
  99         ret = strnvis(msgbuf_strvised, msgbuf, sizeof(msgbuf_strvised), VIS_NL);
 100         if (ret < 0) {
 101                 fprintf(stderr, "%s: strnvis failed", getprogname());
 102                 syslog(LOG_CRIT, "strnvis failed");
 103                 exit(1);
 104         }
 105
 106         if (log_errno == -1) {
 107                 if (peer_name != NULL) {
 108                         fprintf(stderr, "%s: %s (%s): %s\n", getprogname(),
 109                             peer_addr, peer_name, msgbuf_strvised);
 110                         syslog(priority, "%s (%s): %s",
 111                             peer_addr, peer_name, msgbuf_strvised);
 112                 } else if (peer_addr != NULL) {
 113                         fprintf(stderr, "%s: %s: %s\n", getprogname(),
 114                             peer_addr, msgbuf_strvised);
 115                         syslog(priority, "%s: %s",
 116                             peer_addr, msgbuf_strvised);
 117                 } else {
 118                         fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised);
 119                         syslog(priority, "%s", msgbuf_strvised);
 120                 }
 121
 122         } else {
 123                 errstr = strerror(log_errno);
 124
 125                 if (peer_name != NULL) {
 126                         fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(),
 127                             peer_addr, peer_name, msgbuf_strvised, errstr);
 128                         syslog(priority, "%s (%s): %s: %s",
 129                             peer_addr, peer_name, msgbuf_strvised, errstr);
 130                 } else if (peer_addr != NULL) {
 131                         fprintf(stderr, "%s: %s: %s: %s\n", getprogname(),
 132                             peer_addr, msgbuf_strvised, errstr);
 133                         syslog(priority, "%s: %s: %s",
 134                             peer_addr, msgbuf_strvised, errstr);
 135                 } else {
 136                         fprintf(stderr, "%s: %s: %s\n", getprogname(),
 137                             msgbuf_strvised, errstr);
 138                         syslog(priority, "%s: %s",
 139                             msgbuf_strvised, errstr);
 140                 }
 141         }
 142 }
 143
 144 void
 145 log_err(int eval, const char *fmt, ...)
 146 {
 147         va_list ap;
 148
 149         va_start(ap, fmt);
 150         log_common(LOG_CRIT, errno, fmt, ap);
 151         va_end(ap);
 152
 153         exit(eval);
 154 }
 155
 156 void
 157 log_errx(int eval, const char *fmt, ...)
 158 {
 159         va_list ap;
 160
 161         va_start(ap, fmt);
 162         log_common(LOG_CRIT, -1, fmt, ap);
 163         va_end(ap);
 164
 165         exit(eval);
 166 }
 167
 168 void
 169 log_warn(const char *fmt, ...)
 170 {
 171         va_list ap;
 172
 173         va_start(ap, fmt);
 174         log_common(LOG_WARNING, errno, fmt, ap);
 175         va_end(ap);
 176 }
 177
 178 void
 179 log_warnx(const char *fmt, ...)
 180 {
 181         va_list ap;
 182
 183         va_start(ap, fmt);
 184         log_common(LOG_WARNING, -1, fmt, ap);
 185         va_end(ap);
 186 }
 187
 188 void
 189 log_debugx(const char *fmt, ...)
 190 {
 191         va_list ap;
 192
 193         if (log_level == 0)
 194                 return;
 195
 196         va_start(ap, fmt);
 197         log_common(LOG_DEBUG, -1, fmt, ap);
 198         va_end(ap);
 199 }